Printhead Installation Instructions 1
EasyCoder PF2i, PF4i, PF4i Compact Industrial, and PM4i
Introduction
This Installation Instructions booklet describes how to install a replace-
ment printhead in an EasyCoder PF2i, PF4i, PF4i Compact Industrial,
or PM4i printer. The illustrations shows installation in an EasyCoder
PF4i printer, but the same principles apply to all printers mentioned
above, even if the width of the printhead or the appearance of the print
mechanism differ to some extent.
If the printer is fi tted with an optional printhead spring (EasyCoder PF4i
only), the spring must be removed to allow the printhead to be pulled
out and refi tted after the replacement printhead has been installed.
When installing a printhead, make sure that the printhead
density and alignment is the same as in the one you replace
and that the printhead is designed for the type of printer
in which you are going to install it. Printheads designed
for EasyCoder F2, F4, or F4 Compact Industrial do NOT
work!
Why does the printhead wear out?
When the media is fed past the printhead, small resistor elements (dots)
on the printhead are electrically charged and thereby heated. The heat
from the dots is transferred to the direct thermal paper or the thermal
transfer ribbon so as to form the dot pattern which makes up the text,
images, or bar codes.
Printhead wear-out is an inevitable process which applies to all thermal
printers regardless of brand. During printing, the dots must be heated
and cooled off very rapidly, which in combination with mechanical
abrasion sooner or later will wear out the printhead, making the printout
gradually weaker. Some dots may even cease to produce any imprint.
Simple Precautions
Some simple measures can be taken by the user to prevent premature
wear-out:
• Clean the printhead regularly, as described in the User’s Guide. Not
only will a dirty printhead produce an inferior printout, but any resi-
due on the dots will prevent heat to dissipate through the media.